1. Human-Computer Interaction Laboratory, Department of Mathematics, Computer Science and Physics, University of Udine, Udine, Italy.
2. Hygiene and Clinical Epidemiology Unit, Azienda Sanitaria Universitaria Friuli Centrale, Udine, Italy.
3. Hygiene and Public Health Unit, Department of Prevention, Azienda Sanitaria Universitaria Friuli Centrale, Udine, Italy.
4. Cardiology Tolmezzo, San Daniele-Tolmezzo Hospital, Azienda Sanitaria Universitaria Friuli Centrale, Udine, Italy.